The Hansatech Instruments oxygen electrode disc is a specialised form of electrochemical cell known as a Clark-type polarographic sensor which comprises a resin bonded central platinum cathode and a concentric silver anode.
During measurements, the anode and cathode are linked by a 50% saturated potassium chloride (KCl) electrolyte solution. The electrolyte forms a bridge between the 2 electrode elements via the aid of a fine paper wick which is applied to the electrode disc during the preparation process along with a fine layer of PTFE membrane which is selectively permeable to oxygen molecules. Both are held in place with an O-ring.
- S1 Clark-Elekctrode
- Oxytherm Electrode Disc (S1/MINI)
- Electrode type: Clark-type polarographic oxygen sensor
- Electrode output: Typically 1.6µA at 21% O2
- Residual current: Typically 0.04µA in 0% O2
- Response time: 10 – 90% typically <5 seconds
- Oxygen consumption: Typically <0.015µmol/hr-1
- Replacement oxygen electrode disc
- For use with Oxyview, Oxygraph+, Oxytherm+ & Oxylab+ electrode control units
- Also used with legacy Oxygraph & Oxylab electrode control units
- Part no. S1.
Since its original design in the early 1970s by Tom Delieu and David Walker, the S1 Clark-type oxygen electrode disc remains largely unchanged – a true testament to the quality and reliability of the sensor. The S1 consists of a platinum cathode and silver anode set into an epoxy resin disc and is prepared for use by trapping a layer of 50% saturated KCl solution beneath an oxygen-permeable PTFE membrane. A paper spacer placed beneath the membrane acts as a wick to provide a uniform layer of electrolyte between anode and cathode.
S1 Oxygen Electrode Disc | Oxygen electrode & chlorophyll fluorescence measurement systems for cellular respiration & photosynthesis research
When a small voltage is applied across these electrodes (with the platinum negative with respect to the silver), the current which flows is at first negligible and the platinum becomes polarised (i.e. it adopts the externally applied potential). As this potential is increased to 700 mV, oxygen is reduced at the platinum surface, initially to hydrogen peroxide H2O2 so that the polarity tends to discharge as electrons are donated to oxygen (which acts as an electron acceptor). The current which then flows is stoichiometrically related to the oxygen consumed at the cathode.
When connected to the electrode control unit, the S1 provides a fast, effective and accurate method of detecting small changes in oxygen concentration.
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- Replacement oxygen electrode disc for legacy Oxytherm control units
- Part no. S1/MINI.
- You can find more information here - Click!